have big dinner 和have a big dinner区别?Dad came home when we finished ( ) big dinner A . having B had . C eat D having a . 答案为什么是A求解!

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have big dinner 和have a big dinner区别?Dad came home when we finished (     ) big dinner A .  having B had .  C eat D having a .  答案为什么是A求解!

have big dinner 和have a big dinner区别?Dad came home when we finished ( ) big dinner A . having B had . C eat D having a . 答案为什么是A求解!
have big dinner 和have a big dinner区别?
Dad came home when we finished ( ) big dinner A . having B had . C eat D having a . 答案为什么是A求解!

have big dinner 和have a big dinner区别?Dad came home when we finished ( ) big dinner A . having B had . C eat D having a . 答案为什么是A求解!
根据排除法,有疑问的只有A. 和 D.,选A.是因为having dinner 的主角是we, 而不是Dad.

答案是错的吧?要么是having dinner,要么是having a big dinner。